/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Converts a long package name to a file name with the supplied extension. Throws a fatal error if the conversion is not successful.
Package filename.
static [FString](API\Runtime\Core\Containers\FString) LongPackageNameToFilename ( const [FString](API\Runtime\Core\Containers\FString) & InLongPackageName, const [FString](API\Runtime\Core\Containers\FString) & InExtension )